CVE-2026-115892

Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or...

GHSA-9PVW-HWFG-92H5 Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type

Summary Wasmtime may panic when the host lowers a component model stream or future into a guest, if the host created that stream or future with one payload type and the guest expects a different one. This can happen when an embedder creates a stream or future, passes it through a guest, receives ...

CVE-2026-115892

The Wasmtime runtime is vulnerable to a Denial of Service (DoS) due to a flaw in how it handles asynchronous streams or futures exchanged between the host and the guest. Specifically, versions 46.0.0 through 48.0.7 and 49.0.4 fail to perform required payload-type checks when values return through...

EUVD-2026-109187

Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or...

CVE-2026-115892 Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type

Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or...